Two Coupes with some similarities, but otherwise different in most aspects such as the model year, maximum occupancy, horsepower, ground shadow size, and height. First of all, the 2013 E-Class Coupe pulls more horsepower than the 2016 Cayman. Also, the E-Class Coupe is both slightly larger and taller than the Cayman. In addition, you'll seat four more passengers in the Mercedes-Benz E-Class Coupe than in the Porsche Cayman. Among similarities are the body structure, market segment, starting price, and fuel economy.